Process for the manufacture of thin-walled light containers



J. KEULERS Dec: 1, 1936.

PROCESS FOR THE MANUFACTURHOF THIN WALLED LIGHT CONTAINERS Filed May 51, 1933 s Sheets-Sheet 1 r INVENTOR. CT Kculens BY 9 WM- A ORNEYS.

PROCESS FOR THE MANUFACTURE OF THIN WALLED LIGHT CONTAINERS J. KEfiLERs' lllllllllilllll 3 Sheets-Sheet 2 .llI IIII!!!IIIIIIIIIIIIIII .llllllllltlltlllfin llllflllllllllflz FiledMay 51, 1953 FIIIII IIIAll rya lllll lo IIIIIIIIIIIIIIII a", I 11,! I llllilll D8C. l, 1936. V 'j s PROCESS FOR THE MANUFACTURE OF THIN WALLED LIGHT CONTAINERS Filed May :51, 19:53 s Sheets-Sheet s II/IIIIIIIIIIIl/II/I/IZ/ll/l/l/IIIIllIlllllllllb '11!1111!III1IIIllllmhllllll llllzllllrlA 'IIIIIIIII IlIIIII/l/l/l/AW%IIIIIIIIIIIIIIID [went/TM? nd use. 1.193s 2,062,910

ff j UNITED S TATELS PATENT orricr.

arcane PROCESS FOR THE MANUFACTURE. OI .THlN-WALLED LIGHT CONTAINERS Jakob Keulers, Hilden; Germany, minor to Vereinigte Stahlwerke Aktiengesellachaft, Dulseldorf, Germany n Application May :1, 193:. Serial Nat-lavas In Germany December 27,193:

claims. (or; its- 148.2

It is known to manufacture seamless containmeans of ma'ndrels, the diameter of which is 'ers and carboys for gaseous and liquid mediums or larger than the free width of the tubes, in such to compose such containers by welding together a manner that one or several mandrels are fixedof metal sheets. The thickness of the wall of upon a bar and are drawn through the tube. 5 such tubes is adjusted in accordance with the -With special advantage for this purpose the proc- 5 laws of the strength science and the official or ess described and claimed in the prior U. S. A.

other rules which have to be taken into considerapatent application Serial Number 671,580 flled' tion, taking as a basis the pressure which will May 1'7, 1933 is used, occur "in the container or carboy; the minimum It is also possible to manufacture in this-manwall thickness ofseamless containers depends ner containers or carboys with a cross section 10 from the manner of manufacture and that of other than circular. For this purpose the manwelded containers from the aptitude'of the'workdrels are profiled in a suitable manner. 1 ing material to be welded. In-consequence there- The invention moreover is based upon the fact of the calculated wall thickness, especially for. that the establishment of the neckand the botlow and moderate pressures is remarkably lower tom at tubes intended for thin-walledcarboys can 15 than it must be chosen on account of the manner be effected in accordance with the usual pressing of manufacture and of the aptitude of the workor forging operation only with great difficulties ing-material. which causes unfavourable folds. The seamless The same is true with respect to the establishcarboys must therefore have thinner walls or the ment of the neck and of the bottom which are bottom and the neck must be connected by weld.- 20

formed in the case of thin-walledcontainers of ing as in the known welded constructiona.

sheet metal pieces which are connected to the In accordance with the present'invention both tubes by means of circular welding seams. parts are established by ramming in such a man- The present invention enables the manufacture ner that'the tube islocally and gradually heated and the utilization of containers and carboys for during. a quick rotating movement. in a turning small or moderate pressures without longitudinal lathe or another suitable machine. By means of and circular seems, the walls of which are as thin rofiled rollers or rolls they are rammed into the as corresponds tothe calculation, whereas forthe desired shape. This ramming is preferably carreasons above explained, thecontainers hitherto ried out at the one side upon a mandrel inserted used r' Same P 1 11 mu be manufactur d into the tube, the end of which is shaped accord- 30 with considerably thicker walls on account of the ing to the shape of the neck and the bottom re- 1 I manner of manufacture of the tubes, the workspectively. 4 .ing of the tube ends for the neck and bottom, the By flaring the tube to such a high degree as aptitude of the working material and the longiprovided forby the present invention, the wall tudinal and circular welding'seams. of the tube does not only suffer a reduction of 35 The containers manufactured in accordance cross section, but the materialis simultaneously withthe present invention are not only cheaper subjected to an extreme proofing test. The than those prior used-because of the saving of proofing test was heretofore effected by pressing working material, but they also work in a more ofl the flanges .by means of water andby tech- 4 economical manner in consequence of their small nological tests, as prescribed by the oillcial rules 40 W i T y q r 1 W f e gh charges in and that 'of classification companies. Such athe a f t a p ta l a b ys for i sta c proof however does not make evident such faults and t e handling 18 more fl fl which become effective only'after a certain time .In accordance with the present invention a of operation due to a great number of unfavours am ss't s p d d y r l n p ss n or able stresses to which the containers are sub- 5 drawing. Said tube is flared or expanded to a jected, A1; thi lgt ti h faults may cause larger d am t r y it receives a m ll 'a destruction or the container and in consequence wall thickness. Thereupon the bottom and the thereof grave accidents.

neck of the container are formed from the work- If the tubes are flared inaccordance with the Y ing material forming the tube. The flaring 0?- present invention the working material is sub- 50 eration is efiected'in such a n e a the dijected to extreme stresses as in no other test, ameter of the tubes is increasedto about 160% proof. By this examination even the slightest ofjthe original diameter, depending upon the refaultsof material or manufacture become clearly quired' wall thickness of the carboys. For inperceptible. It is thereby-possible either to re* 56 stance the flaring or xpanding is eiiec ed 'by move such faults or to eliminate the defective tube from the further operation. In this manner with a wall thickness sufiicient for the manufacture of the internal or external thread-orof an internal 'and external thread. Otherwise this would only be possible by weldingspecial flanges upon the tube.

The strengthening parts may be provided at the interior or at the exterior part of the tube or at both places. They can be obtained during the manufacture of the seamless'tube by means of rolling, for instance'in such a manner, that the rolls are caused to move upwards, (auflahren) when they pass over that part of the tube which shall be provided with a strengthening so that the distance of the rolls is altered.

With special advantage theinvention can be carried out by producing a seamless tube with several local strengthened parts and separating said tube into several sections from which the several containers may be produced. The thickened portions of the tubes forming the original blank can be shaped in such a manner, and the tubes may be divided in such a manner, that the bottom of the container receives also a strengthened portion. This may be of advantage especially in cases in which a working of the bottom is necessary. 7

The containers produced in accordance with the present invention are not only cheap on account of saving material, but they are alsomore economical in the operation -due to their smaller weight. In consequence thereof a preferred embodiment of the invention consists in using the containers manufactured in the described man: ner for the reception of mediums of moderate and low pressure, more particularly as transportable bottles.

The invention will be more clearLv illustrated by way of examples with reference to the accompanying drawings.

Fig. 1 shows a longitudinal section of a flaring device according to the prior application which may preferably be used for the flaring step of the method according to the present invention.

. Fig. 2 is a side elevation according to Fig. 1.

Fig. 3 schematically shows the first part of the ramming operation.

Fig. 4 shows the flat of the container.

Fig. 5 shows the flnal shaping of the bottom of the container. v

Fig. 6 shows a modified arrangement of pressing rollers. Fig. 'lis a further modification of the rollers. Fig. 8'shows an embodiment of a container manufactured according to the present invention.

Fig. 9 shows a seamless tube provided with pressing of the bottom local strengthened portions.

Fig. 10 shows a finished container. The flaring device or draw bench is provided withan abutment block carrying a draw plate a1, a: divided on the plane of the axis. The half member (11 of the draw plate is disposed in the lower fixed part of the abutment b1 and the other half a: can swing with the top ofthe abutment c about the axis d parallel to the central M18. The

tube r broached at its end to the desired diameter by an upsettingpressed and provided with the flange f1 and having previously been brought to drawing temperature is rolled from the side into the drawing frame whose upper half is turned'up so as to be adjacent with the flange h-to the lower half of the draw plate 111, G2.

whereupon the top half 01 of the frame is turned. down together with the upper half a: of the draw plate. The conical drawing plugs 1, s:

with increasing outer diameter are ready anddisposed on a table before the abutment block. They possess a bore through which the drawing rod z is pushed, and after the latter has been passed through these bores, the plugs .91, 82 are connectedwith the rod 2 by the wedges 101, k: and on the return drawn through the tube 1' in one operation or singly. When the desired extent of flaring has been attained; the top of the abutment block is turned up andthe tube removed from the device.

Figs. 3-5 schematically show the ramming of the tube ends. Fig. 3 shows the first part of said operation-in which the roller a inserted into the support, presses ofl the end of. the tube 1' into the interior. I

Fig. 4 shows the fiat pressing of the bottom and Fig. 5 the final shaping of the bottom upon the mandrel c inserted into the tube. The roller 'a is rotatably and movably mounted so that it can be arranged in any desired position with respect to the longitudinal and transverse axis of. the tube 1'. Thereby and due to a suitable profllation ofthe roller a; it is possibleto obtain any desired shape for the bottom and the neck.

Instead of one roller a it is possible to arrange several rollers either behind each other in the to the desired thin wall thickness and separated at the places designed by 1 into several sections...

from each of which one container is to be formed.

the present inven- Thereupon the neck and the bottom of each container are formed by ramming the wall of the tube in the described manner. The strengthened portions e areshaped into the container.

In Figure 10 the neck portion of the finished container 0 is strengthened so that it. delivers sufficient material for the interior and exterior threads, depending upon the manner of .the used ciosin'g cap and of the valve, and yet possesses still a certain minimum wall thickness. If the neckportion of the bottom It is also to be strengthened, the strengthened portion of the tube wall is made of the required'length and is separated. at the places i,"

so that 'the strengthened portions can be used atv the one side for the neck portion and at the other side for the bottom. Y

What I claimand desire to secure by Letters Patent of the United States is:

1. Process for the manufacture of thin-walled light containers such as carboys, which consists in flaring a'seamless tube to a larger outer diameter whereby the wall thickness is also dii 2,099,910 minished to the desired extent, and in a further ameter, which are secured on a bar, through the tube, the tube being flared to a larger outer diameter and its wall-thickness diminished to the desired extent, and in a iurther shaping of the flared tube at the ends to a container.

3. Process for the manufacture of thin-walled light containers such as carboys, which consists in drawing several mandrels oi non-circular cross section of increasing diameter, which are secured on a. bar, through the tube, the tube being flared to a larger outer diameter and its wall-thickness diminished to the desired extent, and in o, further shaping of the flared tube at the ends tofa con-. tainer.

4. Process for the manufacture of thin-walled light containers such as carboys, which'consists in flaring a seamless tube, which is provided with several strengthened portions, to a larger outer diameter whereby the wall-thickness is also di- 3 to the-desired'extent. and has further shaping oi-the flared tube at the ends to a container.

- 5. Process for the manufacture of thin-walled light containers such as carboys, which consists in flaring a seamless tube, which is provided with several strengthened portions, each-oi which corresponds to a single container. to a larger outer diameter whereby thewall-thickness is also d1- m'inished to the desired extent, and in separating the said tube into several sections and in a further shaping oi these sections at the ends to containei's.

6. Process for the manufacture of thin-walled light containers such as carboys, which. consists in flaring a seamless tube, which is provided with several strengthened portions, each oi. which corresponds to a single container, to a larger outer diameter whereby the wall-thickness is diminished to the desired extent, and in separating the said tube into several sections and in .a further shaping of these sections at the ends to containers, the strengthened portions forming the materiai for the neck and the bottom oi the container. JAKQB KEULERS. 

